Treatment of artificial goods from viscose



UNITED: STATES PATENT OFFICE.

MAX LUFT, 0F BORAS, SWEDEN.

TREATMENT OF ARTIFICIAL GOODS FROM VISCOSE.

11o Drawing.

To all'wlzomit may concern: 7

Be it known that I, Dr. MAX Lur'r, a citizen of Poland, residing at Boras, Sweden, have invented certain new and useful Improvements in Treatment of Artificial.

Goods from Viscose; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as'will enable others skilled in the art to which it appertains to make and use the same.

My invention relates to the treatment of artificial fabrics, filaments, tissues, films and the like from viscose with water-repellent or water-proofing means and it consists in the manner in which the materials are treated.

It is well known in the manufacture of artificial fabrics, as artificial silk, films, plates and the like from viscose (solutions of cellulose-xantha-te) to separate the sulphur and its compounds accumulating in the said goods during the decomposltion of the xanthates by treating them with solutions of sulphides of alkali.

According to my present invention the artificial goods are treated with solutions of soap or with water-proofing means while the process of separating the sulphur and its compounds from the said goods is going on. I have found that during this process the viscose is very capable to absorb soaps and water-proofing ingredients. The sulphur leaving the interior of the capillary filaments causes the instant formation of pores in the filaments and renders their walls permeable so that the soap and the impregnating means are uniformly incorporated into the artificial goods without weakening them.

By this combination of the simultaneous separation of the sulphur from the fabric or the thread and the incorporation on its place into the hollow structure of the viscoseproducts of the finishing ingredients, as soaps, solutions of gum or any other waterrepellent or water-proofing means, I attain a considerable advantage as against the known methods for softening or impregnating of fabrics which might likewise be used for viscose. The new process does awa with the inconvenience experienced untll now that the fabrics stick after their treatment and that their impregnation is diminishing with the time by washing.

Specification of Letters Patent.

Application filed March 9, 1920. Serial No. 364,543.

According to my invention I carry out the treatment in a single bath-process. F. i. the soap might be added in an alkaline solution to the solution of sodium-sulphide. Or if the fabrics are at the same time to be impregnated, the metallic salts, the solution of gum, resin or salts of resin (metallic-resinates) are solved or emulgated with an addition of a small quantity of alkali and this solution or emulgation is added to the desulphurizing-bath before the fabrics are brought into it. The bath is kept during the treatment, which lasts to 1 hour, on a temperature of 4050 C. Repleted with an addition of fresh sodium-sulphide, soap or of the impregnating means, the bath may be repeatedly used. The treated goods is freed from the excess of the bath, acidified, washed in plain water or in a solution of soap, centrifugated or squeezed and dried at a temperature of 4050 C. The concentration of the desulphurizing bath, of the solution of soap and the impregnation means depends in a wide range upon the goods to be treated and upon the degree of the required properties as to the softness, the lustre, and the elasticity.

Examples of the treatment bath are as follows:

.1. A watery solution is prepared containing 3% sodium sulphide, 2% soap, 5;% caustic soda. The finished raw silk in skeins is treated in this bath for about one-half to one hour at a temperature of 50 degrees C.

2. The bath contains 3% sodium sulphide, 2% soap, 2% caustic soda, 5% aluminum acetate.

The treatment of the silk is the same as in the first example.

I claim:

1. In the treatment of artificial goods from viscose which has an interstitial sulphur content the step of subjecting the goods to a single bath containing soap and sulphide of sodium for the purpose described.

2. In the treatment of artificial goods from viscose which has an interstitial sulphur content the step of subjecting the goods to a single bath containing desulphurizing agents, soap, and impregnating means for the purpose described.

3. The method of treating artificial goods from viscose containing sulphur-precipitate interiorly thereof, which consists in substaninteriorly thereof, which consists in substantially simultaneously desulphurizing and tially simultaneously desul-phurizing and filling the resulting interstitial spaces with filling the resulting interstitial spaces with 10 a finishing impr eghation-precipitate, suba finishing impregnation-precipitate in the 5 sta-ntially a s setforthi 1 presence of alkali, substantially as set forth.

4. The method of treating artificial goods In testimony whereof I aflix m si nature. from viscose contaming sulphur-precipitate MA L FT, 

